Premanufactured roof plate element

ABSTRACT

A prefabricated roof plate element ( 4 ), including one or more longitudinal box-shaped girders ( 24 ), each consisting of two predominantly U-shaped metal sections ( 10, 18 ) which at mutually facing, open sides are interconnected along narrow outwards bent lateral edges ( 5 ), the girders ( 24 ) being connected at upper and lower narrow sides corrugated in longitudinal direction with corrugated metal plates ( 7 ) corrugated in transverse direction and having approximately the same width as the roof plate element ( 4 ), the girders ( 24 ) being disposed along opposing sides and at the centre of the roof plate element ( 4 ), where the girders ( 4 ) and the roof plate element ( 4 ), respectively, are designed with reduced height/thickness at an end part intended for forming eaves ( 6 ). By means of simple technical measures is hereby achieved substantial projecting advantages which furthermore have appeared to enable an architecturally very simple and light construction of the visible part of the roof plate on buildings.

FIELD OF THE INVENTION

The present invention concerns a prefabricated roof plate element of thekind indicated in the preamble of claim 1.

BACKGROUND OF THE INVENTION

Prefabricated roof plate elements of this kind may be produced of 100%inorganic materials, which have great significance for durability andmaintenance. Besides, it is of great significance that the roof plateelements in question may have a free span of up to 22 metres, i.e. onesingle roof plate element may cover about 80 m², which of course hasgreat significance with regard to reducing the building period.

OBJECT OF THE INVENTION

It is the purpose of the invention to indicate a further improved roofplate element of the kind mentioned in the introduction, which by meansof simple technical measures has appeared to entail very substantialprojecting advantages, and which furthermore has appeared to enable anarchitecturally very simple and light construction of the visible partof the roofing on buildings.

DESCRIPTION OF THE INVENTION

The roof plate element according to the invention is characterised inthat the girders and the roofing element, respectively, are designedwith reduced height/thickness at an end part intended for forming eaves.By means of simple technical measures is hereby achieved substantialprojecting advantages which furthermore have appeared to enable anarchitecturally very simple and light construction of the visible partof the roofing on buildings.

Suitably, the roof plate element according to the invention is designedsuch that the lowermost of the U-shaped metal sections are shorter thanthe uppermost of the U-shaped metal sections, and that the uppermostU-shaped sections are closed downwards at the end part intended to formeaves by means of U-shaped metal sections, which are disposed internallyof the uppermost U-shaped metal sections and fastened thereto.

With the intention of transmitting the necessary forces betweenrespective parts of the box-shaped girders, the roof plate elementaccording to the invention is advantageously designed so that theextreme end parts of the lowermost metal sections are connected with theuppermost metal sections by means of rectangular connecting sheets,preferably at both sides of the girders.

With the intention of increasing the rigidity of the girders, the roofplate element according to the invention is suitably designed so thatthe upper and lower metal sections at opposite ends and spaced along theentire length are provided with predominantly rectangular transversebulkheads consisting of metal sheets with angular connecting flangeswhich are fastened preferably by means of screws to all three sides ofthe metal sections.

Suitably, the roof plate element according to the invention is designedso that the rectangular connecting sheets are disposed inside the metalsections, that the transverse bulkheads are disposed opposite verticalsides of the connecting sheets, and that the connecting sheets andbulkheads at the same time are connected with respective sides of themetal sections by means of screws.

For further increasing productivity in the production of the roof plateelement according to the invention, it may be advantageous to design theroof plate element so that the rectangular connecting sheets aredisposed inside the metal sections, that the metal sections disposedinside the upper metal sections continue inwards beyond the connectingsheets, that the transverse bulkhead is disposed opposite both verticalsides of the connecting sheets, and that the connecting sheets,bulkheads and internal metal sections at the same time are connectedwith respective sides of the metal sections by means of screws.

In order to further stabilise the rigidity of respective box-shapedgirders, the roof plate element according to the invention is preferablydesigned so that the transverse bulkheads in respective metal sectionsare disposed opposite each other, and that respective connecting flangesthereof are also interconnected.

With the object of facilitating anchoring the roof plate elementaccording to the invention to building structures, it is advantageous todesign the roof plate element so that it is designed with a transverseopening opposite an innermost part of the end part intended for formingeaves.

DESCRIPTION OF THE DRAWING

The invention is now explained more closely in connection with thedrawing, in which:

FIG. 1 shows a sectional view of a part of a roofing with an embodimentof a roof plate element according to the invention;

FIG. 2 shows a sectional view of a part of a roofing with a secondembodiment of a roof plate element according to the invention;

FIG. 3 shows an elementary sketch of a preferred embodiment of a girderfor a roof plate element according to the invention;

FIG. 4 shows a sectional view through the girder shown in FIG. 3 forillustrating its assembly for use in a roof plate element according tothe invention;

FIG. 5 shows a photographic view of an embodiment of a girder, cf. FIG.3, for a roof plate element according to the invention;

FIG. 6 shows a photographic view illustrating joint assembly details bymanufacturing of a girder for at roof plate element according to theinvention; and

FIG. 7 shows a drawing of a building with a roofing with an embodimentfor a roof plate element with eaves according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 and 2 show sectional views of a building 2 provided withembodiments of roof plate elements 4 according to the invention, whereeaves 6 are established by means of roof plate elements 4 with reducedthickness/height from the edge of the building 2, where the roof plateelements 4 are supported and anchored on steel girders 8 in such a waythat the roof plate elements 4 within the steel girders 8 have greaterthickness/height than outside the steel girders 8.

As it also appears from FIGS. 1 and 2, the roof plate elements 4opposite an innermost part of the end part intended to form eaves 6 aredesigned with a transverse opening 28, through which it is possible toanchor roof plate elements 6 to girders 8, e.g. by means ofprefabricated angle braces 30. Subsequently, the opening 28 is filledwith insulating material before mounting a loose cover plate 32 andcovering with roofing material.

FIGS. 3 and 4 show connected sketches of a roof plate element 4 whichhas eaves 6 with reduced thickness/height outside a steel girder 8. Theeaves 6 consist of an outer extended part of an upper U-shaped metalprofile 10 which is closed downwards by means of a U-shaped metalprofile 12 disposed internally of the metal profile 10, and whichextends inwards beyond similar internal rectangular connecting sheets14.

An outer end 16 of a lower metal profile 18 is connected with the uppermetal profile 10 by means of the connecting sheets 14 and by means ofangular connecting flanges 20 of traversing bulkheads 22, which aredisposed opposite vertical side edges of the connecting sheets 14 insuch a way that the connection with the metal profiles 10, 12, 18 andthe connecting sheets 14 and the connecting flanges 20, respectively,may be established at once by means of screws extending throughrespective parts.

FIG. 4 shows most clearly that the upper and lower metal profiles 10, 18are interconnected at opposite outwards bent lateral edges 5, e.g. bymeans of clinching (press jointing) or in other ways, that lower andupper narrow side of the metal profiles 10, 18 are designed withtrapezoidal profiling 19, and that the connecting flanges 20 of theplate-shaped bulkheads 22 and the internal U-profile 12 areinterconnected by means of screws.

FIG. 5 show girders 24 during production, i.e. shown with the top sidefacing downwards, so that the eaves 6, which are downwards closed bymeans of the said U-shaped metal profiles 12, are clearly seen.Photographic view 6 shows how the connecting sheets 14 during productionof the girders 14 is disposed inside the girders 24.

FIG. 7 shows an example of a building 26 which is provided with eaves 6according to the invention, and which thereby obtains a outermost, lightending at the roof plate elements.

By the shown and described embodiment of a roof plate element accordingto the invention, it is the lower parts of the metal profiles of thegirders that are not provided from the edge of the building, so that theeaves 6, the roof plate element and girders, respectively, consist ofupper extended metal profiles with internal U-shaped metal profileswhich are closed downwards, but there is, of course, nothing to hinderthat the roof plate element according to the invention is made reversed,i.e. where the reduced thickness/height faces upwards.

In that case, the lower U-shaped metal profiles of the girders continueoutwards and form the eaves themselves in such a way that the lowerU-shaped metal profiles of the girders, e.g. along the edge of thebuilding, are suspended at outer end parts of the upper metal profilesby means of connecting sheets, etc. The upwards reduced height/thicknessof the roof plate element may thus suitably be used for forming anoutwards inclining roof gutter, as the roof plate element may befinished outwards by an raised edge or end plate (sternplade).

Finally, it is to be noted that prefabricated roof plate elementsaccording to the invention may consist of one or more girders 24, e.g.with mutual positioning cf. claim 1, and where upper cover plates areconstituted by corrugated metal sheets, insulation plates covered withasphalt roofing or film roofing. Such a roof plate element according tothe invention may downwards e.g. be covered with perforated, corrugatedsteel sheets that are secured directly at the bottom side of the girders24, and which thereby form part of the roofing.

1. A prefabricated roof plate element, including one or morelongitudinal box-shaped girders that each consists of two predominantlyU-shaped metal sections which at mutually facing, open sides areinterconnected along narrow outwards bent lateral edges, the girdersbeing connected at upper and lower narrow sides corrugated inlongitudinal direction with metal plates corrugated in transversedirection and having approximately the same width as the roof plateelement, the girders being disposed along opposing sides and at thecentre of the roof plate element, characterised in that the girders andthe roof plate element, respectively, are designed with reducedheight/thickness at an end part intended for forming eaves.
 2. Roofplate element according to claim 1, characterised in that the lowermostof the U-shaped metal sections are shorter than the uppermost of theU-shaped metal sections, and that the uppermost U-shaped sections areclosed downwards at the end part intended to form eaves by means ofU-shaped metal sections, which are disposed internally of the uppermostU-shaped metal sections and fastened thereto.
 3. Roof plate elementaccording to claim 1, characterised in that extreme end parts of thelowermost metal sections are connected with the uppermost metal sectionsby means of rectangular connecting sheets, preferably at both sides ofthe girders.
 4. Roof plate element according to claim 1, characterisedin that the upper and lower metal sections at opposite ends and spacedalong the entire length are provided with predominantly rectangulartransverse bulkheads consisting of metal sheets with angular connectingflanges which are fastened preferably by means of screws to all threesides of the metal sections.
 5. Roof plate element according to claim 3,characterised in that the rectangular connecting sheets are disposedinside the metal sections, that the transverse bulkheads are disposedopposite vertical sides of the connecting sheets, and that theconnecting sheets and bulkheads at the same time are connected withrespective sides of the metal sections by means of screws.
 6. Roof plateelement according to claim 1, characterised in that the rectangularconnecting sheets are disposed inside the metal sections, that the metalsections disposed inside the upper metal sections continue inwardsbeyond the connecting sheets, that the transverse bulkhead is disposedopposite both vertical sides of the connecting sheets, and that theconnecting sheets, bulkheads and internal metal sections at the sametime are connected with respective sides of the metal sections by meansof screws.
 7. Roof plate element according to claim 3, characterised inthat the transverse bulkhead in respective metal sections are disposedopposite each other, and that respective connecting flanges thereof arealso interconnected.
 8. Roof plate element according to claim 1,characterised in that it is designed with a transverse opening oppositean innermost part of the end part intended for forming eaves.